50 



SYNOPSIS OF 



"^ 

 O 



Q 

 O 



O ^ 

 CM 



I 



o 



OVAL. 



An. paludosus. Tur. 



An. grossa. Zeig. 



An. compressa?* Zeig. 



An. obvoluta?* ^ea^g-. 



An. spuria. Count YoldVs letter. 



An. proboscidalis. Zeig. 



An. piscinalis. Nil. 



Anodontites cygnea.t Poir. 



Anodontites anatina. Poir. 



fragilis. Lam. 



uniopsis. Lam. 



undulata. Say. 



Anodon rugosus. Swain. 

 Anodonta Pennsylvanica. Lam,. 



Wardiana. Lea. 

 A. virgata. Con. 



edentula. Lea. 



Alas, edentula. Say. 

 Anodon areolatus. Swain. 



Coop. 



ought to be considered a distinct species, and I am much disposed to think 

 that such will prove to be the fact. 



* On the authority of Ferussac. 



f On the authority of Des Mouiins. 



